Features:
* Alternative to DSC/DTA as a primary thermal hazard screening method
* Wide temperature range
* Simultaneous pressure and temperature data
* Rapid sample turn around
* Representative sample
* Low running costs
Complete Systems:
The Thermal Screening Unit (TSu) has been developed for the first step in
reaction hazards assessment, a more comprehensive solution than traditional
screening by DSC/DTA .
For effective reaction hazards screening, two critical pieces of data need to be determined: the “onset” temperature for the reaction and the pressure generated by the runaway.
The TSu offers you the simplicity of operation associated with DSC and DTA, whilst providing pressure data. In addition, by utilising sample cells of up to 8ml, representative samples can be tested.
Specification
Operating Modes:
The standard procedure involves heating of the sample at a user defined rate
(typically 0.5 to 5°C/minute) while both the temperature and pressure
are recorded. Deviation from linearity (e.g. a sharp rise) indicates the “onset”
of an exotherm. The subsequent rise shows the severity of hazard directly
without the need for any calculation.
Additional operating modes include isothermal, dual scan and soak-and-scan are available.
Operating Range:
Temperature from ambient to 400°C, resolution of 0.01°C. Pressure
transducers available in several ranges, typically up to 200 bar.
Test Cells:
Spherical test cells of approximately 8ml in stainless steel, hastelloy, and
other alloys are available as well as in glass. This large volume allows for
truly representative samples, and the study of liquids, solids and reaction
mixtures.
Running Experiments:
winISO has been developed in house to provide a logical and simple interface
for development of multiple step processes. It runs under Windows software.
During operation all conditions are displayed numerically and on a trend graph.
All steps can be modified during operation. Modifications are fully documented
in the output file.
Applications:
Thermal stability of feeds, intermediates and products.
Test liquids and solids.
Evaluate long term exposure at elevated temperatures (isothermal or "soak" test).
Evaluate safe operating and storage temperatures, as well as the consequences of a runaway reaction.
Key Data Produced:
-Onset temperature of exotherm.
-Rate of temperature rise.
-Rate of pressure rise.
-Maximum temperature and pressure.
-Time from exotherm initiation to maximum rate.
Multiple Units:
Several TSus can be used in parallel, running from the same computer. This
is a cost effective method of screening large numbers of samples. The compact
design of the instrument makes it easy to fit several units into a standard
fume cupboard.
